A man has been arrested under the Terrorism Act in Bushmills.
The man, who is believed to be in his 60s, was detained following a search at a house in the Church Street area of the village on Thursday afternoon.
Detective Inspector Bob Blemmings said the investigation is ongoing.
He said: “The policing operation in the area continues and there are no further details at this stage.”
The man has been taken to Musgrave Serious Crime Suite for questioning.